Narrated Ibn 'Umar:that the Messenger of Allah (ﷺ) said: "Islam is based upon five: the testimony of La Ilaha Illallah, and that Muhammad is the Messenger of Allah, the establishment of the Salat, giving the Zakat, fasting (the month of) Ramadan, and performing Hajj to the House

English translation · Jami' at-Tirmidhi